Checked: October 2026. USCIS's page "Tips for Filing Forms Online" says: "Files must not be larger than 6MB in size, and must be in one of these formats: PDF, JPG, JPEG, TIF or TIFF." It does not state a maximum number of files. Its attorney and representative page lists no limits at all and tells filers to check the upload screen or the form instructions.
A figure that changed
A USCIS online filing webinar from 28 March 2024 had a slide reading "Maximum file size: 12 mb". The current tips page says 6 MB. We cannot tell which limit applies to which part of the system, or whether it was changed. The safe approach is to keep every file under 6 MB and to treat any error message in your account as the final word.
What USCIS asks for beyond size
- Make sure all text is clear and readable. A sharp scan beats a pretty photo.
- If a document is in a foreign language, upload an English translation along with the original. Do not replace the original with the translation.
- If a form asks you to sign a signature page, download it, sign it, and scan it or take a picture with your phone.
- The tips page suggests scanning each document or photographing it with your phone.
Preparing files without uploading them anywhere
Immigration evidence contains your passport, birth certificate, tax records and addresses. DocPro's tools run in your browser and do not send the file to a server, which is worth having for this kind of paper.
- Turn phone photos into a PDF with Images to PDF. One PDF per document keeps your evidence tidy.
- If a document spans several pages or files, merge them into one PDF in the order you want a reviewer to read them.
- Look at the file size in your file manager. If it is over 6 MB, use Compress PDF with a target such as 5 MB. For tighter limits, the pages for 2 MB and 1 MB targets show how far a PDF can go. The tool reports the final size.
- Pair the translation with the original: put the original first and its English translation straight after it in the same PDF, or upload them as two clearly named files. USCIS asks for both.
- Open the finished file and zoom in. Dates, A-numbers, receipt numbers and signatures must be legible.
For general advice on shrinking files, see the guide to compressing a PDF for email and upload limits. If a photo is for an application, see the US passport photo preset. The preset is for passport photos, not for every USCIS photo, so check the instructions for your form.
Names and clarity
USCIS does not publish a naming rule on the pages we reviewed, but descriptive names such as Birth_certificate_original.pdf and Birth_certificate_English_translation.pdf save you from confusion if you have to upload again.
Splitting one case into clean files
A typical filing for a family case contains a passport, a birth certificate, a marriage certificate, tax transcripts and several translations. Uploading each as a separate, correctly named PDF means that if one is rejected you only fix one file. For long records, such as a year of bank statements, merge the statements into a single PDF first and compress that one file. If the result goes over 6 MB, split it into two parts by date range rather than pushing the compressor harder.
Check each PDF in a viewer on your own device before you upload. Open View PDF, scroll through every page, and make sure no page is rotated sideways or upside down. A rotated page is a common mistake with phone scans, and Rotate PDF fixes it in seconds.
Other immigration portals set different limits, for example the UK visa application upload rules.
Common upload problems
- A phone photo saved as HEIC. The accepted list in the USCIS page does not include HEIC, so convert it to JPG with the image converter first.
- A file just over the limit. Compress to a target that leaves room, such as 5 MB.
- A blurry page after heavy compression. Split the document into two parts rather than lowering the quality further.
- A password-protected PDF. The 2024 webinar slide mentions password protected or encrypted files without saying whether they are accepted, so remove protection from your own copy first if you can.
This post covers file preparation only. It is not legal advice and DocPro is not affiliated with USCIS.